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2.
something said to your chums when you haven't seen them in a bit, usually with a beer in your hand and a few in your belly

also something you say to someone you meet on the street that you recognize but don't know very well. A type of "nod" and courtesy to say hello.
Hey there lad, g'day g'day and how are ya t'day?
by koso October 15, 2005
 
1.
Something people say in the Ottawa Valley whether they're drunk, sober, or copulating with an attractive cousin or sheep.
Delmer McDelmer: G'day g'day and how ya t'day!
Sheep: Baaaaaa!!!!
by smacktard April 27, 2003
 
3.
a saying used to greet friends, usually when drunk
Tom: "g'day g'day and how are ya t'day?"

Bill: "good, and yerself?"
by Bruce April 10, 2003